a chilling look at aaron alexis as he moves around the building. it was cut on surveillance camera. he thought he was being controlled by electromagnetic waves. tom? theonight come in light of information released, it was obvious aaron alexis was severely ill when he entered the navy yard. they question how things were allowed where he could bring a shotgun here. ♪ tonight, different faiths prayed are those who were hurt in the mass shooting. >> we are thinking about them. >> the d.c. mayor grew fiery. gun laws still cannot stop a mentally ill man from buying a gun in virginia and killing 12 people in d.c. >> the only restaurant is -- the only question is -- >> we are truly heartbroken. >> authorities released new information and video of the shooter, aaron alexis. he arrived at the parking garage in the morning. .e entered the building over the next hour, he scours the building, looking for victims. in this video, he is caring his shotgun around and looking for people to kill at random. >> there is no evidence at this point to indicate he targeted anyone he worked for or with. >>